. >> robin has a big interview with michelle obama later and then she's headed out to hollywood. >>> and ahead, robin's revealing int interview with diane sawyer. >>> also coming up, we have the astonishing seconds caught on camera when a 17-year-old snowboarder plunges four stories off of a chair lift. i know. it's terrifying. and this morning, he reveals why he fell. >> he's okay. >>> also, a woman who finally helped snare an alleged internet scammer who was stealing women's hearts. and then, stealing their money. >> a lot to look forward to. >>> but let's get to the latest on the so-called breakup murder trial. jodi arias facing a withering cross-examination thursday. the prosecution, taking direct aim at her credibility. abc's ryan owens has all of the latest details, he comes to us from phoenix, arizona. ryan, good morning. >> reporter: good morning to you, amy. all of a sudden, we met a brand-new jodi arias. forget that soft-spoken, sobbing woman we got to know on the stand the past eight days. she was replaced by a smiling, sometimes smug defendant, who was ready to fight for